rocker arm


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rocker arm

[′räk·ər ‚ärm]
(mechanical engineering)
In an internal combustion engine, a lever that is pivoted near its center and operated by a pushrod at one end to raise and depress the valve stem at the other end.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

rocker arm

rocker arm
A pivoted arm in the cylinder head of an aircraft reciprocating engine. It is actuated by the push rod to push open the intake or the exhaust valve.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
The kinematic research begins when the angular velocity ra5 of the rocker arm 5 is arbitrarily assigned in magnitude and direction similar to a link, which according to the formula of the structure of the mechanism is another arbitrarily possible driving link of the mechanism: on the velocity diagram let us mark vectors [??]d of arbitrary length in the direction along the perpendicular to the line DK, the direction of the angular velocity [[omega].sub.5] is selected arbitrarily, for example clockwise.
Once baseline testing was complete, the stock intake and exhaust rocker arms were removed and replaced with units containing hydraulic lash adjusters.
Scott Reynolds, Executive Vice President, states, “Scorpion takes precision manufacturing to a whole new level with its new Endurance Series shaft mount rocker arms. These rockers were designed for professional circle track, dirt track, drag racing and offshore powerboat race engines.
"They're mostly made out of old car parts, more exactly internal engine parts - pistons, push rods, camshafts, some exhaust parts, little rocker arm studs.
* The engine mount, rocker arm, swivel, elbow and swing arm castings were poured from fully degassed and fully grain refined metal.
It is equipped with a flywheel, camshaft, and rocker arm that replicate the actuation in the engine, firing at different test points, said Schena.
With a resin cam moving the rocker arms, metal-to-metal contact is eliminated, another noise reduction feature.
Roller side of the rocker is moved according to these cam lobes so that other end of the rocker arm pushes corresponding valve up and down with the help of a preloaded spring.
The mechanism consists of a rocker arm with twin links that close the intake valves by transferring rotational movement to the output cam via a driveshaft with an eccentric cam.
The prototypes then were cast in one of three molds--a plate, a bushing or a rocker arm (Figs.
The valvetrain usually is made up of the camshaft, rocker arm, valve lifter, and valve spring.